opticalCON DUO to Duplex ST singlemode Fiber Optic Breakout Cables. Two Fibers only, no electrical conductors. Designed for Broadcast & Pro-Audio Applications! Ruggedized opticalCON DUO fiber optic cables designed for internal wiring of racks and patch panels. Quickly adapt opticalCON DUO equipment to standard ST fiber systems. OpticalCON assemblies are COCA factory terminated and machine polished. Cables are assembled with lockable and water proofed metal caps as well as rubber guards. This is especially critical for outdoor applications. The ergonomically cable strain relief improves the cable protection and water resistance in long-term use. Custom Lengths & Configurations Always Available!